Impact driver



FIG. 1 is a top, rear and left perspective view of an impact driver showing our design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a left side elevation view thereof;

FIG. 5 is a right side elevation view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken lines in the drawings illustrate portions of the impact driver that form no part of the claimed design. 

CLAIM The ornamental design for an impact driver, as shown and described. 